lastly it was the cores side that were not happy with thier 35% spring 2017 support. which is why core devs (luke JR) proposed the mandatory activation.
you do realise there is this thing called the blockchain. its a immutable archive of events and transactions.
if you were to actually check the blockchain data you will see that core triggered it at block 478558.
the funny thing is core supporters actually shouted that cash didnt trigger until hours later.
(core only accepted segwit flagged blocks at 13:23)
(cash only accepted cash blocks at 18:12)
the code that achieved this split was wrote by core devs (luke JR UASF)
https://www.uasf.co/#uasf-signalingWhat is BIP148?
BIP148 is a UASF that is designed to cause the existing SegWit MASF deployment to cause activation in all existing SegWit capable node software (which currently is 80% of the network nodes). How does BIP148 Work? From August 1st, 2017, miners are required to signal readiness for SegWit by creating blocks with the version bit 1. This will cause all SegWit ready nodes, which make up over 80% of the network, to activate and begin enforcement. Link for reference: luke.dashjr.org/programs/bitcoin/files/charts/segwit.html. Miners must also check blocks prior to their own and ensure that they also signal for SegWit, and only build on those blocks.
please do your research next time
lastly. its the mindset of some that bitcoin(network) should be owned by one team brand. wherby they go on the 'defend the dev' parade and try to make it sound that anyone who is against a dev is against bitcoin. purely to continue their mantra that bitcoin should have one central team.(facepalm)
its a real shame that those people cannot distinguish the difference between one dev team control from the concept of a whole network concept of consensus of teams.
have a nice day.